diff --git a/customize.dist/messages.js b/customize.dist/messages.js
index fd8a5f879..a0a181908 100755
--- a/customize.dist/messages.js
+++ b/customize.dist/messages.js
@@ -157,6 +157,8 @@ define(req, function(AppConfig, Default, Language) {
         }
     };
 
+    Messages.admin_logoType_error = 'The logo image file type is not allowed'; // XXX
+
     return Messages;
 
 });
diff --git a/www/admin/inner.js b/www/admin/inner.js
index 00765e344..d3ff09093 100644
--- a/www/admin/inner.js
+++ b/www/admin/inner.js
@@ -1064,9 +1064,13 @@ define([
 
             Util.onClickEnter($button, function () {
                 let files = input.files;
+                let fileTypes = ['image/png', 'image/svg+xml', 'image/jpeg'];
                 if (files.length !== 1) {
                     UI.warn(Messages.error);
                     return;
+                } else if (!fileTypes.includes(files[0].type)) {
+                    UI.warn(Messages.admin_logoType_error);
+                    return;
                 }
                 spinner.spin();
                 $button.attr('disabled', 'disabled');